/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.example.http.websocketx.server;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.util.CharsetUtil;

/**
 * Generates the demo HTML page which is served at http://localhost:8080/
 */
public final class WebSocketServerIndexPage
{

    private static final String NEWLINE = "\r\n";

    public static ByteBuf getContent(String webSocketLocation)
    {
        return Unpooled.copiedBuffer(
                "<html><head><title>Web Socket Test</title></head>" + NEWLINE
                        + "<body>" + NEWLINE
                        + "<script type=\"text/javascript\">" + NEWLINE
                        + "var socket;" + NEWLINE + "if (!window.WebSocket) {"
                        + NEWLINE + "  window.WebSocket = window.MozWebSocket;"
                        + NEWLINE + '}' + NEWLINE + "if (window.WebSocket) {"
                        + NEWLINE + "  socket = new WebSocket(\""
                        + webSocketLocation + "\");" + NEWLINE
                        + "  socket.onmessage = function(event) {" + NEWLINE
                        + "    var ta = document.getElementById('responseText');"
                        + NEWLINE
                        + "    ta.value = ta.value + '\\n' + event.data"
                        + NEWLINE + "  };" + NEWLINE
                        + "  socket.onopen = function(event) {" + NEWLINE
                        + "    var ta = document.getElementById('responseText');"
                        + NEWLINE + "    ta.value = \"Web Socket opened!\";"
                        + NEWLINE + "  };" + NEWLINE
                        + "  socket.onclose = function(event) {" + NEWLINE
                        + "    var ta = document.getElementById('responseText');"
                        + NEWLINE
                        + "    ta.value = ta.value + \"Web Socket closed\"; "
                        + NEWLINE + "  };" + NEWLINE + "} else {" + NEWLINE
                        + "  alert(\"Your browser does not support Web Socket.\");"
                        + NEWLINE + '}' + NEWLINE + NEWLINE
                        + "function send(message) {" + NEWLINE
                        + "  if (!window.WebSocket) { return; }" + NEWLINE
                        + "  if (socket.readyState == WebSocket.OPEN) {"
                        + NEWLINE + "    socket.send(message);" + NEWLINE
                        + "  } else {" + NEWLINE
                        + "    alert(\"The socket is not open.\");" + NEWLINE
                        + "  }" + NEWLINE + '}' + NEWLINE + "</script>"
                        + NEWLINE + "<form onsubmit=\"return false;\">"
                        + NEWLINE
                        + "<input type=\"text\" name=\"message\" value=\"Hello, World!\"/>"
                        + "<input type=\"button\" value=\"Send Web Socket Data\""
                        + NEWLINE
                        + "       onclick=\"send(this.form.message.value)\" />"
                        + NEWLINE + "<h3>Output</h3>" + NEWLINE
                        + "<textarea id=\"responseText\" style=\"width:500px;height:300px;\"></textarea>"
                        + NEWLINE + "</form>" + NEWLINE + "</body>" + NEWLINE
                        + "</html>" + NEWLINE,
                CharsetUtil.US_ASCII);
    }

    private WebSocketServerIndexPage()
    {
        // Unused
    }
}
